Numerical simulations of negatively buoyant jets in an immiscible fluid using the Particle Finite Element Method

Mier-Torrecilla, M.; Geyer, Adelina; Phillips, Jeremy C.; Idelsohn, Sergio; Oñate, Eugenio

doi:10.1002/fld.2628

Cited by 7 publications

(4 citation statements)

References 42 publications

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“…These studies mostly focused on vertical fountains [10][11][12]. The fountain is inherently different from the inclined dense jet because it re-entrains the negatively buoyant fluid which falls back around the vertical discharge.…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulations of 45° inclined dense jets

et al. 2015

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Submerged inclined dense jets (negatively buoyant jets) occur in many engineering applications such as brine discharges from seawater desalination plants and decooling water discharges from liquefied natural gas plants, and their mixing behavior needs to be examined in details for the environmental impact analysis. In the present study, a detailed numerical investigation was performed using the large eddy simulation (LES) approach with both the Smagorinsky and Dynamic Smagorinsky sub-grid scale (SGS) models to simulate the characteristics of the inclined dense jet with 45°inclination. The numerical predictions included the jet trajectory, geometrical characteristics, jet spread and eddy structures. Experimental measurements were also obtained for the validation of the LES predictions, and data from existing studies in the literature were included for comparison. Overall, the LES predictions were able to reproduce the geometric characteristics of the inclined dense jet in a satisfactory manner in most aspects. The dilution was however generally underestimated, which was attributed primarily to the inability of the SGS models to reproduce the convective mixing induced by the buoyancy-induced instability using the adopted grid spacing in the bottom half of the inclined dense jet.

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Section: Introductionmentioning

confidence: 99%

Large eddy simulations of 45° inclined dense jets

et al. 2015

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“…The jet then reaches its maximum penetration height, reverses direction and flows back. This problem has been experimentally and numerically studied in [25].…”

Section: Negatively Buoyant Jetmentioning

confidence: 99%

The Particle Finite Element Method for Multi-Fluid Flows

Idelsohn

Mier-Torrecilla

Marti

et al. 2011

Particle-Based Methods

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This paper presents the Particle Finite Element Method (PFEM) and its application to multi-fluid flows. Key features of the method are the use of a Lagrangian description to model the motion of the fluid particles (nodes) and that all the information is associated to the particles. A mesh connects the nodes defining the discretized domain where the governing equations, expressed in an integral form, are solved as in the standard FEM. We have extended the method to problems involving several different fluids with the aim of exploiting the fact that Lagrangian methods are specially well suited for tracking any kind of interfaces.

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“…Scaling analysis may be used also to compare results of experiments with those of numerical modeling (e.g. Mier-Torrecilla et al 2012). Other dimensionless numbers not presented in this section but relevant for volcanic phenomena are presented hereafter.…”

Section: The Scaling Issuementioning

confidence: 99%

The contribution of experimental volcanology to the study of the physics of eruptive processes, and related scaling issues: A review

Roche

Carazzo

2019

Journal of Volcanology and Geothermal Research

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The experimental approach has become a major tool increasingly used by volcanologists in recent decades to investigate the physics of eruptive processes in complement to field and theoretical works. Researchers have developed various methodologies to study volcanic phenomena at reduced length scale. The works involve natural or analogue materials and their types range from first-order tests, to identify fundamental processes and make qualitative comparison with field observations, to more sophisticated experiments in which precise data obtained in a controlled environment can be used to validate outputs of theoretical models. Scaling is a central issue to ensure dynamic similarity between the small-scale experiments and the large-scale volcanic phenomena when natural conditions cannot be simulated due to inherent length scale difference and/or technical limitations. In this respect, dimensionless numbers are used to map physical regimes and to define scaling laws, which allow experimental results to be extrapolated to natural scale. This review presents the variety of experimental studies conducted to investigate subterraneous and aerial volcanic phenomena involving in particular fluid-particle mixtures. We focus on the major scaling issues and the physical regimes investigated, and we also highlight in a historical perspective some of the major advances achieved through experimental studies. Finally we conclude on some perspectives for future works.

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Numerical simulations of negatively buoyant jets in an immiscible fluid using the Particle Finite Element Method

Cited by 7 publications

References 42 publications

Large eddy simulations of 45° inclined dense jets

Large eddy simulations of 45° inclined dense jets

The Particle Finite Element Method for Multi-Fluid Flows

The contribution of experimental volcanology to the study of the physics of eruptive processes, and related scaling issues: A review

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